fwrite/fputs seems to always add a single newline whenever it
sees 1 or more newlines in the string. This occures even when
restricting output to a single character.
e.g.
fputs($fp,"\n",1);
fputs($fp,"something else");

This will output two newlines instead of one. I could see no way to
output a single newline (I even tried some urldecode combinations).